I was exchanging tweets with an old colleague about using Twitter for her upcoming show. I noticed that her show's name (and logical variants, like <showname year>) have not been claimed.
A Twitter ID may be meaningless to you today if you're not planning on using it right away. And maybe it doesn't have and will never have the value of a URL. But it has value. And just like there were squatters holding URLs hostage, it's bound to happen with Twitter.
Grab your show name and open an account now. Before I do.